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Chapter 31: Q11. (page 1231)

Question: Locate the isoprene units in biformene, a component of amber, and classify biformene as a monoterpene, sesquiterpene etc.

Short Answer

Expert verified

Answer

Biformene is a sesquiterpene.

Step by step solution

01

Isoprene

Isoprene units come under the category of unsaturated hydrocarbons. It comprises five carbon atoms possessing double bonds. Carotene is an example of an isoprenoid.

02

Biformene

Biformene is a kind of terpene comprising the molecular formula C₂₀H₃₂ . It is a natural product found in the flower Helianthus decapetalus.

03

Locating the isoprene units in biformene

The skeletal structure of biformene can be given as:

Skeletal structure of biformene

Terpenes comprise repeating five-carbon units termed isoprene units. Each isoprene unit shall consist of five carbon atoms, four carbons in a row, and one-carbon branch on a middle carbon.

The isoprene units in the given terpene, biformene are indicated in blue color as:

Isoprene units of biformene

The given terpene comprises four isoprene units. Hence, biformene is a sesquiterpene.

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Most popular questions from this chapter

Question: Draw a stepwise mechanism for the conversion of neryl diphosphate to $α - p i n e n e$ , $α - p i n e n e$ is a component of pine oil and rosemary oil.

Question: An isoprene unit can be thought of as having a head and a tail. The “head” of the isoprene unit is located at the end of the chain nearest the branch point, and the “tail” is located at the end of the carbon chain farthest from the branch point. Most isoprene units are connected together in a “head-to-tail” fashion, as illustrated. For both lycopene (Problem 31.26), and squalene (Figure 31.9), decide which isoprene units are connected in a head-to-tail fashion and which are not.

Convert the ball-and-stick model of androsterone to (a) a skeletal structure using wedges and dashed wedges around all stereogenic centers; and (b) a three-dimensional representation using chair cyclohexane rings.

Question: Locate the isoprene units in each compound.

Draw the products formed when triacylglycerol A is treated with each reagent. Rank compounds A, B and C in order of increasing melting point.

$H_{2} O$ , $H^{+}$
data-custom-editor="chemistry" $H_{2}$ (excess),data-custom-editor="chemistry" $Pd - C \to B$
$H_{2}$ (1 equiv), $Pd - C \to C$

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